mineral

Chrysoprase (Nickel-bearing Chalcedony)

Silicon Dioxide (SiO2) with traces of Hydrous Nickel Silicates

Hardness: 6.5–7 on Mohs scale; Color: Apple-green to light green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Monoclinic (Cryptocrystalline); Cleavage: None; Specific Gravity: 2.6–2.9

Hardness: 6
Color: Apple-green to light green
Luster: Vitreous to waxy

Identified March 27, 2026More mineral →

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Physical properties

Hardness: 6.5–7 on Mohs scale; Color: Apple-green to light green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Monoclinic (Cryptocrystalline); Cleavage: None; Specific Gravity: 2.6–2.9

Formation & geological history

Formed through the deep weathering or lateritization of nickeliferous serpentinites or other ultramafic rocks. Generally found in saprolite zones and quartz veins in arid or semi-arid environments.

Uses & applications

Used primarily as a gemstone for jewelry (cabochons, beads) and ornamental carvings. Historically used to decorate palaces and churches due to its rich color.

Geological facts

Alexander the Great was rumored to carry a piece of chrysoprase in his belt for victory. Its green color is unique among silica minerals because it comes from nickel, rather than chromium or vanadium.

Field identification & locations

Identify in the field by its distinct apple-green color, conchoidal fracture, and association with brown iron oxides (limonite) or magnesite. Common locations include Queensland (Australia), Poland, Brazil, and Arizona (USA).

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